Optional Form Fields - One field needs to be required and valid

Im using jquery and jquery.validate to validate an online form i have made.
The client has requested that either the 'Home/Work' or 'Mobile' phone field has to be entered for the form to be valid. So both fields will be marked as a requirement to start with and the form becomes valid upon one of the fields being entered and valid, making the other field optional.

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Nothing in an HTTP request can be trusted, including HTTP headers and form data. A form token is a tool that can be used to guard against request forgeries (CSRF). This article shows an improved approach to form tokens, making it more difficult to…